k about pix5 don knapp is there with more, what are you hearing? >> reporter: the police have an unconscious victim on their hands. trying to decide if it was a violent crime or an accident played in a dangerous game on roof tops. >> santa rosa investigators exam what looks like blood on the wall of montgomery high. a doctor walking his dog found the teen with a wound to the back of his head unresponsive. he administered first aid and called 911. the 17-year-old was taken by helicopter to oakland children's hospital and remains in a medically induced coma. now, they are trying to determine if the boy fallen from the roof or if had he was the victim of an assault. one thaoery is that he may have been involved in a high risk dangerous game. >> one thaoer sethat he may have been involved in a high risk dangerous -- one theory is that he may have been involved in a high risk of dangerous games. >> he was here on the same campus with other young friends of his where one of the young men fell and broken his leg. >> reporter: because of where the teen was